I move my safes myself, and usually my wife helps .
The door off idea helps, but lining the door back up again, is never easy. For that reason, I leave the doors on.
A pallet jack is also a good idea to own, if you move them around much. Purchased one at an estate sale, to move pallets, and later discovered the pallet jack really helps in moving safes. Big safes have wheels under them, the height of a pallet jack.
I also own a mule, sometimes known as a Johnson bar. It is a 6' long pry bar on two wheels.
It helps move the safe, turn a safe, or get it in the air to feed in golf balls.
In nearly 3 decades, we have moved our safes about 6 times, never fun, but we have most always done it ourselves. At first, I hired a tow truck to move the big ones, but that gets costly. They hire out for less money than safe movers, but doing it yourself is the best price.